Process for removing scale from incrusted surfaces.



' Ho Drawing.

UNITED STATES PATENT OFFICE.

- THOMAS RITCHIE GREENHORNE, OF GLASGOW, SCOTLAND.

PROCESS FOR REMOVING SCALE FROM INCRUSTED SURFACES.

containing carbonate, i. 6., carbonate of lime and/or ma esia,.from the internal surfaces of steam boilers.

' of lime and magnesia.

' In accordance with the invention there is passed directly into the boiler, when filled with cold water, a charge ofcarbonic acid gas which enters intoso ution in the water,

the water charged with such gas being allowedto remain in the boiler a sufiicienttimesay 48 hours or thereaboutto effect loosening of scale from the metal surface caused by the solvent and disintegrating action of the CO solution on the carbonatesv Specification of Letters Patent.

Patented Apr. 13, 1915.-

Applicatlon lllcd September 26, 19 13. Serial-No. 791,959.

The carbonic acid gas may be derived from any suitable source, e. 9., from a cylinder containin gas under pressure, a connection being ta, en from the cylinder to the bottom of the boiler. The boiler is closed at the time the as is admitted so that a supersaturated so ution is formed.

I claim:

The hereindescribe'd process of removing scalefrom the incrusted internal surface of a boiler, consisting in filling the boiler with cold water, passing directly into the cold water in the boiler a charge of carbonic acid gas under pressure to form a supersaturated solution of carbonic acid gas in water, and allowing the supersaturated solution of carbonic acid gas in water to act on the incrusted surface.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

THOMAS RITCHIE GREENHORNE. Witnesses:

WALLACE CRANSTON,

DOUGLAS KEITH. 

